Hi all, just looking through some Lincolns last night and came across this.

I can only find one listing for an '84-D RPM, but I don't think that it is the same as this.
At first, I thought that it may be
Machine Doubling, but I cannot find any traces of any doubling anywhere except for the mint mark. Is it possible to have
Machine Doubling on just the mint mark.
Any help at all is greatly appreciated.